I must say I really like the shape of her cheek-bone!
I don’t know how familiar with Blender you are, but I have seen some very convincing results for hair using the new particle system. I am not at a point in my own project to learn that yet, so I’m afraid the only real help I can give you in that regard is to let you know it exists! :-?
Another idea to help you in modelling something like a human face is to do a google search on faces (female faces, in this case) and compare your model to what you find. Not comparing hsape or even proportion so much as looking at the qualities and characteristic that make up the female face. I think you’ve very nearly got it, model-wise, though it looks like some tweaking of the forehead and chin could be used. No real help on the hair here though, sorry.